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EuTl2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to twelve equivalent Tl atoms. There are six shorter (3.41 Å) and six longer (3.83 Å) Eu–Tl bond lengths. Tl is bonded in a 10-coordinate geometry to six equivalent Eu and four equivalent Tl atoms. There are three shorter (3.08 Å) and one longer (3.29 Å) Tl–Tl bond lengths.
EuTl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Eu–Tl bond lengths are 3.91 Å. Tl is bonded in a body-centered cubic geometry to eight equivalent Eu atoms.
Eu3Tl is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded to eight equivalent Eu and four equivalent Tl atoms to form distorted EuEu8Tl4 cuboctahedra that share corners with four equivalent TlEu12 cuboctahedra, corners with fourteen equivalent EuEu8Tl4 cuboctahedra, edges with six equivalent TlEu12 cuboctahedra, edges with twelve equivalent EuEu8Tl4 cuboctahedra, faces with four equivalent TlEu12 cuboctahedra, and faces with sixteen equivalent EuEu8Tl4 cuboctahedra. There are a spread of Eu–Eu bond distances ranging from 3.51–3.90 Å. There are two shorter (3.52 Å) and two longer (3.70 Å) Eu–Tl bond lengths. Tl is bonded to twelve equivalent Eu atoms to form TlEu12 cuboctahedra that share corners with six equivalent TlEu12 cuboctahedra, corners with twelve equivalent EuEu8Tl4 cuboctahedra, edges with eighteen equivalent EuEu8Tl4 cuboctahedra, faces with eight equivalent TlEu12 cuboctahedra, and faces with twelve equivalent EuEu8Tl4 cuboctahedra.